Night vision

Night vision is the ability to see in low light conditions. Whether by biological or technological means, night vision is made possible by a combination of two approaches: sufficient spectral range, and sufficient intensity range. Humans have poor night vision compared to many animals, in part because the human eye lacks a tapetum lucidum.

Types of ranges

Spectral range

Night-useful spectral range techniques can sense radiation that is invisible to a human observer. Human vision is confined to a small portion of the electromagnetic spectrum called visible light. Enhanced spectral range allows the viewer to take advantage of non-visible sources of electromagnetic radiation (such as near-infrared or ultraviolet radiation). Some animals such as the mantis shrimp can see using much more of the infrared and/or ultraviolet spectrum than humans.

Intensity range

Sufficient intensity range is simply the ability to see with very small quantities of light.

Many animals have better night vision than humans do, the result of one or more differences in the morphology and anatomy of their eyes. These include having a larger eyeball, a larger lens, a larger optical aperture (the pupils may expand to the physical limit of the eyelids), more rods than cones (or rods exclusively) in the retina, and a tapetum lucidum.

Kage

Kage may refer to:

KAGE

KAGE may refer to:

KAGE (AM)

KAGE (1380 AM) is a radio station broadcasting a Country music format. Licensed to Winona, Minnesota, USA, the station features programming from AP Radio.

It is owned by Leighton Broadcasting, through licensee Leighton Radio Holdings, Inc., and is located at 752 Bluffview Circle, with its other sister stations.

It was originally on 1570 kHz and moved to 1380 kHz in 1958.

References

External links